Question 1

Which of the following best describes the primary function of the autonomic nervous system (ANS)?

Accepted Answer

To regulate involuntary functions such as heart rate, digestion, and glandular secretion

Question 2

A patient presents with abnormally high heart rate and dilated pupils after a car accident. Which division of the ANS is most likely responsible for these symptoms?

Accepted Answer

Sympathetic division

Question 3

Which neurotransmitter is released by preganglionic fibers in both the sympathetic and parasympathetic divisions of the ANS?

Accepted Answer

Acetylcholine

Question 4

A drug blocks muscarinic receptors. Which physiological effect would most likely be observed?

Accepted Answer

Increased heart rate due to reduced parasympathetic activity

Question 5

Which of the following equations correctly represents the relationship between heart rate ($$HR$$), stroke volume ($$SV$$), and cardiac output ($$CO) as $$regulated by the ANS?

Accepted Answer

$$CO = HR 	imes SV$$

Question 6

Which pathway correctly describes the route of a sympathetic preganglionic fiber from the spinal cord to a target organ?

Accepted Answer

Spinal cord → ventral root → white ramus communicans → sympathetic chain ganglion → postganglionic fiber → target organ

Question 7

Which cranial nerve carries approximately 90% of all parasympathetic preganglionic fibers?

Accepted Answer

Vagus nerve (CN X)

Question 8

A patient is given a medication that increases the firing rate of sympathetic fibers to blood vessels. What is the expected physiological effect?

Accepted Answer

Vasoconstriction and increased blood pressure

Question 9

Which of the following best explains the concept of dual innervation in the ANS?

Accepted Answer

Organs receive input from both the sympathetic and parasympathetic divisions, often with opposing effects

Question 10

Which of the following is a real-life example of a visceral reflex mediated by the ANS?

Accepted Answer

Regulation of heart rate in response to changes in blood pressure

Question 11

A patient with damage to the hypothalamus may experience which of the following symptoms due to impaired autonomic control?

Accepted Answer

Difficulty regulating body temperature and blood pressure

Question 12

Which of the following statements about adrenergic receptors is correct?

Accepted Answer

Alpha and beta adrenergic receptors are activated by norepinephrine and epinephrine

Question 13

Which equation best represents the effect of sympathetic stimulation on blood pressure ($$BP) $$via vasoconstriction ($$VC$$)?

Accepted Answer

$$BP \propto VC$$

Question 14

A patient is experiencing excessive salivation and slowed heart rate. Which branch of the ANS is most likely overactive?

Accepted Answer

Parasympathetic division

Question 15

Which of the following is true regarding the neurotransmitter released by postganglionic sympathetic fibers?

Accepted Answer

Most release norepinephrine, but some release acetylcholine (e.g., sweat glands)

Question 16

Which of the following best describes the effect of increased firing of sympathetic fibers to the heart?

Accepted Answer

Increased heart rate and force of contraction

Question 17

Which of the following is a correct statement about the organization of the sympathetic division?

Accepted Answer

Preganglionic neurons originate in the thoracic and lumbar regions of the spinal cord

Question 18

A patient is given a medication that blocks beta-adrenergic receptors. Which effect would most likely be observed?

Accepted Answer

Decreased heart rate and contractility

Question 19

Which of the following best explains why most visceral organs receive dual innervation?

Accepted Answer

To allow precise regulation and balance between sympathetic and parasympathetic effects

Question 20

Which of the following is the most significant example of ANS regulation of blood pressure?

Accepted Answer

Baroreceptor reflex

CH 14

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